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Old 2nd September 2006, 04:09 AM   #1
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Default JX92 VTL enclosure with other unit?

Hi all,

I would like to know is anyone have experience on JX92 VTL transmission line enclosure with other unit, like Fostex or TB?

Thanks!
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Old 2nd September 2006, 04:03 PM   #2
Colin is offline Colin  United Kingdom
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Have a look at the Caolina Audio site. They've specialisd in the VTL for a while and are using the same basic design with other units. It's basically a Daline TL, so you could adjust line length, line area and chamber volume to match other units.
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Old 3rd September 2006, 12:38 PM   #3
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Default Me too...

I have been looking into trying this too - VTL type box with Fostex drivers.

Colin - couldn't find info on the Carolina site other than that with Jordan drivers.

Anyone have any info on design of Daline TLs?

Thanks
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Old 3rd September 2006, 03:04 PM   #4
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Old 3rd September 2006, 05:29 PM   #5
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Yes! I am also thinking to use Fostex or TB into the JX92 VTL Box! Just I cant get any info or sharing about this. Anyone can help? Thanks!
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Old 4th September 2006, 09:01 AM   #6
Colin is offline Colin  United Kingdom
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Dear Setting

Have a look at the 6XL design on the Carolina Audio site - this is a scaled up VTL for a woofer/tweeter arrangement.

There is a PDF of the original 1970s Daline article by Robert Fisk here
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Old 6th September 2006, 05:41 AM   #7
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I have read the Daline article very interesting indeed. Following this, I did some calculations with winISD and came up with the following for the Fostex FE103E:

Cavity volume 3L
Box tuning frequency 50Hz (?)
Line csa and length to suit box dimensions

According to the results given by winISD the Fostex FE108EΣ should be a straight swap.

Any thoughts?

Many thanks,

Lee
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Old 8th September 2006, 04:23 AM   #8
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http://www.fostexinternational.com/d...igma_enc.shtml


The VTL by Fostex in a version for the FE108 sigma. They call it a
Spiral Horn, not to be confused with another 'spiral horn' with a different
internal layrinth in a pvc pipe.


These are a lot more work than a BIB but might fit some environments
better.
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Old 8th September 2006, 09:16 AM   #9
Colin is offline Colin  United Kingdom
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This one is slightly different in that the line expands to the mouth, presumably to give it a little horn action. The VTL keeps a constant area line and the original Daline tapers towards the mouth. They all use a similar principle, though of using the chamber as a bandpass filter between driver and line.
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Old 8th September 2006, 01:19 PM   #10
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Just make sure you don't try tuning below 0.707Fs or your midbass will start to go AWOL. So the enclosure for a 108 ideally doesn't want to go below ~54.5Hz, and preferably not that low. Remember too that the Sigma is a low excusion driver with an Xmax of 0.28mm, which doesn't give much leeway. They can go further, but distortion will rapidly increase.
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